Mechanical pencil



Nov. 27, 1928.

J. C. WAHL MECHANICAL PENCIL Filed April l2, 1924 marl' that the sameis susceptible of moditication rasees Nev. 27, ieee.-

roi-In c, wenn or cnrceec, mentors, assitance 'ro 'rmi war-1L COMPANY, or onroaeo, narratore, .a conronnrrorr or DELAWARE.

VMEGHANCAll PENCIL.

Application le April 12,

My invention relates to pencils, and primarily to that class ot pencils commonly called mechanical pencils. rlhe mechanism- April 1S, 1921. `Among the objects ot this invention is to provide novel means tor de tachahly securing the tip vend of the pencil tothe barrel; it'nrther to provide improved means for securing` the eraser cover in `operativeV position 5 'further to provide an improved form oli clip attaching means; further to generally improve the construction of pencils of the mechanical type; and such urther objects, advantages and capabilities as will later more tully appear.

, My Yinvention further resides in the combination, vconstruction and arrangement ot parts illustrated in the accompanying drawings, and while l have shown therein a preferred embodiment l wish it to be understood and change without departing from the spirit of my invention.

ln the drawings Y Figa 1 is a longitudinal sectional view of my invention; v

Fig. 2 is aA view,partially in section and partially in elevation;. I

Fig. 3 is a 'fragmentary view of the upper portion oi' the pencil showing the method of holding a clip-in the, barrel;

Fig. l is a detail view showing the detachable tip, and part ot the mechanism forV propelling a lead cil;

Fig. 5 is a perspective view of the shell on i the interior ot' the barrel of the pencil, and

the nut which holds the sait shell from loi:n

gitudinal movement within the barrel;

Fig. 6 is a perspective view of the eraser holding device adapted to be screwed to the top of the shell shown in Fig. 5;

Fig. 7 isa cross section through the line 7-7 in Fig. l, and

. Fig. 8 is a cross section through the line 8 8 in Fig. 1.

The numeral 1 indicates the metal barrel, or outer shell, of a. mechanical pencil con structed in accordance `.with my invention. The said shell 1 is swedged at its lower eX- tremity to form a shoulder 2. The numeral 3 indicates a shell which is adapted to be inserted in the barrel l. This shell 3 is swedged through the barrel ot the peniese. Y serial no. 705,979.

n and threaded at its upper extremity, as at 4l,

and is swedged a little over one halt of its length from the lower extremity as is shown in Fig. 5. rlhe lower swedged end of the shell is corrugated in four places as at 5 forming Ouide ways in the interior thereof, the tunetion ot these guide ways to be hereafter de, scribed. f.

The lower end of the shell is threaded as at 6 to receive a correspondino'ly threaded nut whose 'function will be hereafter described. A groove 8 is pressed into the upper and larger part ot the shell 3. This groove communicates with the external surface of the lower snf'edged end ot the said shell and beveled inthe upper part of its bottom se that the groove at its upper end is of a depth equal to the thickness ot' the clip 9, which is adapted to be inserted through the barrel and align with the said groove.

i-rn aperture l0 is provided in the bottom or this grooveto receive t-he projection 11 on the inner tace ot the clip, and an aperture 12 is pr vided in the barrel to receive a projection i3 on the outer tace of the rear end of the clip. lt will clearly be seen that when the shanlrot the clip) is inserted through the aperture 14 an d the shell 8 is forced into the top end ot' the barrel 1, that the projection 11 will engage in the aperture 10 in the shell, and thus, with the engagement of the pro jectien 13 with the corresponding aperture 12 in the barrel, the clip will be held securely in place between ie barrel and shell wit-hout the use ot solder or other securing means.

lnasinuchas the pressing in of the groove V8 resins a lshoulder V15 in the shell it may be s'en tl .it the shell may only be inserted in the barrel until this shoulder 15 contacts with the n* per end of' the clip, thus preventing tu r downward movement of theI said shell, and leaving the swedged and threaded d .Xtending from the top end of the ,tion caused by slitting the eraser holder as at 19, the part on each side ot the slit tending to spring together. A groove 20 which en- Cil circles the said eraser holder is provided. This groove-is adapted to receive a bead 30 formed on the interior of an ornamental eraser cover 2l thus permitting the eraser Cover to be securely fastened to said eraser holder. It will be clearly seen that direct longitudinal pull of the cap will cause the eraser holder 22 is swedged to form, a small aperture in its y lower end, which aperture receives a steel friction point 23.

Fixedly mounted on the interior of the tip 22 is a tube 24 provided with a spiral slot 25 extending practically its ength. lvlonnted in the said tube and having one oi its ends outturned to extend outl of the slot 25 in the tube 24 is a teed wire 26 which is adapted to travel up and down-to thus propel or permit to be retracted a lead mounted in the tube 24 below the feed wire.

Spiral tube 24 is provided at its upper enc with resilient gripping means for holding the tip in operative association with the iencil. In Fig. l this gripping means shown as a tubular head 3l secured to tube by means of a pin 32 inserted into the tube 24 and held there by friction;- or as shown in Fig. 4 the gripping` head 3l may be iormed integral with tube 24. ln both iorms the gripping head is slitted as shown at 88, and the parts on both sides ot the slit slightly spread apart so that when the gripping head is inserted into the lower end otl shell 3 said parts will be forced toward each other by contact with ribs 34 formed by pressing inwardly the metal of the shell at grooves 5, and a gripping action thus provided sufficient to hold in place said tube 24, tip 22, and point 23.

Having described my invention, what I claim as new and desire to secure by Letters Patent is:

l. In a mechanical pencil, a barrel, a shell adapted to be inserted in said barrel and provided with inwardly offset elongated members, a tip detachably mounted at one end oi said barrel, a tube iixed to said tip and adapted to extend within said shell, and means onl said tube to coact with said oiiset members to detachably hold said tip in operative position.

rel, a shell adapted to be inserted in said barrel and provided with inwardly oiiset elongated members, a detachable tip mounted at one end of said, barrel, a lead receiving and feeding tube tion means at the inner end et said tube arranged to coact with said offset members to ifrictionally hold said tube and tip in operative position, said :friction means comprising a slitted head, the members et which are constructed to move toward each other suticient to cause a sliding friction grip with said oii'- set members lwhen saidv tube is inserted therein.

4. In a. mechanical pencil, a barrel, inwardly oi'fset elongated members in said barrel, a detachable tip mounted on one end of said barrel, an elongated tube fixed to said tip to extend within said barrel between said oils-:et members, lead feeding mechanism associated with said tube, said tube having resilient gripping means to be engaged between said offset members to detachably secure said tip tosaid barrel.

5. A mechanical pencil comprising a barrel, a shell mounted in said barrel, said shell provided with inwardly oiiset portions, a detachable tip mounted at one end ot said barrel, a lead receiving and feeding tube secured to said tip, and friction means on said tube arranged to coaet with said offset portions to frictionally hold said tube and tip in operative position. 5

(i. A mechanical pencil comprisino a barrel, a shell mounted in said barrel, said shell provided with inwardly oiiset elongated members, a detachable tip mounted at one end of said barrel, a lead receiving and feeding tube secured to said tip, and friction means at the inner end of said. tube arranged to coaet with said oiiset members to friction-A ally hold said tube and tip in operative position.

In witness whereof, have hereunto subscribed my name.

JOHN o. WAHL.

secured to said tip, and 'tric- 

